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The average age of menarche was about 12.7 years in ... Menstruation is a cultural as well as scientific phenomenon as many societies have specific rituals and ...
The average age of the first period is generally later in the developing world, and earlier in the developed world. [3] [9] The average age of menarche has changed little in the United States since the 1950s. [3] Menstruation is the most visible phase of the menstrual cycle and its beginning is used as the marker between cycles. The first day ...
Menstruation (also called menstrual bleeding, menses or a period) is the first and most evident phase of the uterine cycle and first occurs at puberty. Called menarche, the first period occurs at the age of around twelve or thirteen years. [8] The average age is generally later in the developing world and earlier in the developed world. [42]
The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
Starting menstruation is an important sign of health. A new study shows that the trend of children starting at an earlier age may point to worrying conditions.
On average, females begin puberty at age 10½ and complete puberty at ages 15-17; males begin at ages 11½-12 and complete puberty at ages 16-17. [1] [2] [3] The major landmark of puberty for females is menarche, the onset of menstruation, which occurs on average around age 12½. [2]
For example, if there is a gestational age based on the beginning of the last menstrual period of 9.0 weeks, and a first-trimester obstetric ultrasonography gives an estimated gestational age of 10.0 weeks (with a 2 SD variability of ±8% of the estimate, thereby giving a variability of ±0.8 weeks), the difference of 1.0 weeks between the ...
In the nearly fifty years since those studies, the ages at which children are beginning puberty has only declined: (as of 2018) "The age of puberty, especially female puberty, has been decreasing in western cultures for decades now [...] for example, at the turn of the 20th century, the average age for an American girl to get her period was 16 ...